Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
nang mai » nang ma, nang tai, lang mai
cham luc » cham soc, nhan luc, chat lua
cua tre » cua te, cuu tre, cua triet
hanh ky » hanh kem
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
ky cua » ly cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((cac ky) or (sach ty)) nang mai hoi. hieu ve ((cham luc) OR (cham cuu)) va hanh ky cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((cac ky) OR (sach ty)) nang mai hoi. hieu ve ((cham luc) OR (cham cuu)) va hanh ky cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((cac ky) or (sach ty)) nang mai hoi. hieu ve ((cham luc) OR (cham cuu)) va hanh ky cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((cac ky) or (sach ty)) nang mai hoi. hieu ve ((cham luc) OR (cham cuu)) va hanh ky cua tre*.